// public void Display() //{ // //SqlConnection sqlConnection = new SqlConnection(connectionString); // //string commandString = @"SELECT Name, Contact, Address FROM Customer"; // //SqlCommand sqlCommand = new SqlCommand(commandString, sqlConnection); // //SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sqlCommand); // //DataTable dataTable = new DataTable(); // //int isFill = sqlDataAdapter.Fill(dataTable); // //if (isFill > 0) // //{ // // dataGridView.DataSource = dataTable; // // return 1; // //} // //else // //{ // // dataGridView.DataSource = ""; // // return 0; // //} // dataGridView.DataSource = _customerManager.ShowData(); // } private void addButton_Click(object sender, EventArgs e) { Cus cus = new Cus(); if (nameTextBox.Text == "" || contactTextBox.Text == "" || addressTextBox.Text == "") { MessageBox.Show("Field must not be emptay.."); Clear(); return; } if (Code.Text.Length > 4) { MessageBox.Show("Can Enter only Four Characters in this Textbox.", "Textbox", MessageBoxButtons.OK, MessageBoxIcon.Error); } if (Contact.Text.Length > 11) { MessageBox.Show("Can Enter only Eleven Characters in this Textbox.", "Textbox", MessageBoxButtons.OK, MessageBoxIcon.Error); } if (_customerManager.IsNameExist(cus)) { MessageBox.Show(nameTextBox.Text + "Already Exits"); Clear(); return; } if (nameTextBox.Text == "" || contactTextBox.Text == "" || addressTextBox.Text == "") { MessageBox.Show("Field must not be emptay.."); Clear(); return; } cus.Code = codeTextBox.Text; cus.Name = nameTextBox.Text; cus.Contact = contactTextBox.Text; cus.Address = addressTextBox.Text; cus.District = districtComboBox.Text; if (_customerManager.Add(cus)) { MessageBox.Show("Saved"); dataGridView.DataSource = _customerManager.ShowData(); } else { MessageBox.Show("Not Saved"); } Clear(); }